I’ve never been one to pack a lunch for work, especially sandwiches (MEH @ sandwiches). So noone’s ever stolen my lunch from the office fridge, but then I don’t know who does those kinds of things.
Someone’s come up with a very simple but effective deterrant: a sealable lunch bag with a mould print on it.
The makers seem to want to charge money for this, but you can probably make your own very easily.
This could backfire if someone tries to do a fridge clean-out and chucks your tasty sandwich because it’s gone mouldy.